AU2002307777B2 - Acetal resin crowns for children - Google Patents
Acetal resin crowns for children Download PDFInfo
- Publication number
- AU2002307777B2 AU2002307777B2 AU2002307777A AU2002307777A AU2002307777B2 AU 2002307777 B2 AU2002307777 B2 AU 2002307777B2 AU 2002307777 A AU2002307777 A AU 2002307777A AU 2002307777 A AU2002307777 A AU 2002307777A AU 2002307777 B2 AU2002307777 B2 AU 2002307777B2
- Authority
- AU
- Australia
- Prior art keywords
- dental crown
- tooth
- crown
- side surfaces
- top surface
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
- DHKHKXVYLBGOIT-UHFFFAOYSA-N 1,1-Diethoxyethane Chemical compound CCOC(C)OCC DHKHKXVYLBGOIT-UHFFFAOYSA-N 0.000 title claims description 13
- 239000011354 acetal resin Substances 0.000 title description 2
- 229920006324 polyoxymethylene Polymers 0.000 title description 2
- 229920001519 homopolymer Polymers 0.000 claims description 14
- 239000011347 resin Substances 0.000 claims description 10
- 229920005989 resin Polymers 0.000 claims description 10
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 229920001169 thermoplastic Polymers 0.000 claims description 5
- 210000004489 deciduous teeth Anatomy 0.000 claims description 3
- 239000004416 thermosoftening plastic Substances 0.000 claims description 2
- 125000002777 acetyl group Chemical class [H]C([H])([H])C(*)=O 0.000 claims 3
- 239000002861 polymer material Substances 0.000 claims 3
- 239000002356 single layer Substances 0.000 claims 2
- 150000001241 acetals Chemical class 0.000 description 8
- 208000002925 dental caries Diseases 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920004943 Delrin® Polymers 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000003479 dental cement Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C13/00—Dental prostheses; Making same
- A61C13/20—Methods or devices for soldering, casting, moulding or melting
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C5/00—Filling or capping teeth
- A61C5/70—Tooth crowns; Making thereof
- A61C5/77—Methods or devices for making crowns
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K6/00—Preparations for dentistry
- A61K6/80—Preparations for artificial teeth, for filling teeth or for capping teeth
- A61K6/884—Preparations for artificial teeth, for filling teeth or for capping teeth comprising natural or synthetic resins
- A61K6/891—Compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
Landscapes
- Health & Medical Sciences (AREA)
- Oral & Maxillofacial Surgery (AREA)
- General Health & Medical Sciences (AREA)
- Epidemiology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Dentistry (AREA)
- Plastic & Reconstructive Surgery (AREA)
- Dental Prosthetics (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Dental Preparations (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
Description
WO 02/083022 PCT/IL02/00310 ACETAL RESIN CROWNS FOR CHILDREN FIELD OF THE INVENTION The present invention relates to tooth prostheses generally and more particularly to crowns.
BACKGROUND OF THE INVENTION The following U.S. Patents and publications are believed to represent the currnt state of the art: 4,129,946; 5,552,390; 5,487,663; 5,624,261; 5,709,548; 6, 1(6,295; SUMMARY OF THE INVENTION The present invention seeks to provide a mass-produced, tooth colored pre-fabricated crown, particularly useful in pediatric dentistry for treatment of primary teeth and permanent molars having extensive carious lesions.
There is thus provided in accordance with a preferred embodiment of the present invention an injection molded dental crown formed of an acetal homopolymer, which includes Polioxymethylene (POM) Thermoplastic Homopolymer.
In accordance with a preferred embodiment of the present invention, the injection molded dental crown is formed with depending side surfaces at least one of which defines an undercut.
Preferably, the depending side surfaces are flexible.
There is also provided in accordance with a preferred embodiment of the present invention a method for mass producing dental crowns comprising: providing a multi-element mold, employing the multi-element mold to injection mold the crown including depending side surfaces, at least one of which defines an undercut.
In accordance with a preferred embodiment of the present invention, the multi-clement mode includes an ejector which is operative to eject the molded crown following opening of the multi-element mold.
BRIEF DESCRIPTION OF THE DRAWINGS The present invention will be understood and appreciated more fully from the following detailed description, taken in conjunction with the drawings in which: Fig. 1 is a simplified pictorial illustration of a dental crown formed of WO 02/083022 PCT/IL02/00310 acetll homopolymer; Fig. 2 is a sectional illustration of the dental crown of Fig. 1, taken along lines II II in Fig. 1; and Figs. 3A, 3B and 3C are each simplified pictorial illustrations of apparalus for manufacturing a dental crown from acetal homopolymer resin in accordance with a preferred embodiment of the present invention in three operative orientations.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT Reference is now made to Fig. 1, which is a simplified pictorial illustration of a dental crown formed of acetal homopolymer resin and to Fig. 2, which is a sectional illustration of the dental crown of Fig. 1, taken along lines II II in Fig. 1.
As seen in Figs. 1 and 2, there is provided in accordance with a preferred embodiment of the present invention an injection molded dental crown 10 formed of an acetal homopolymer resin. A preferred material for the crown is acetal homopolymer resin (DELRIN®) which is commercially available from DuPont.
As can be readily seen in Figs. 1 and 2, the dental crown 10 is formed with a generally conventionally tooth shaped top surface 12 and depending side surfaces 14 al least one of which defines an undercut 16. Preferably, the depending side surfaces 14 are flexible. Crown 10 may readily be mounted, by conventional methods, such as through the use of dental cement in the mouth of a patient, typically a child, as part of treatment of primary teeth and permanent molars having extensive carious lesions. It is a particular feature of the invention that crown 10 is of a color which generally matches of the patient's teeth.
The crown of the present invention is characterized by high tensile strength, high impact resistance and stiffness, excellent fatigue endurance and resistance to moisture, excellent dimensional stability and sufficient resilience and resistance to creep. It has the natural appearance of a vital tooth Reference is now made to Figs. 3A, 3B and 3C, which are each simplified pictorial illustrations of apparatus for manufacturing a dental crown from acetal homopolymer resin in accordance with a preferred embodiment of the present invention in three operative orientations.
As seen in Figs. 3A, 3B and 3C, the crown 10 is molded in a mold cavity which is defined by a top mold element 22, a bottom mold element 24 and an ejector WO 02/083022 PCT/IL02/00310 26. The ejector 26 forms part of an internal mold element 32.
Fig. 3A shows the stage of molding when the top mold element 22 lies in tight engagement with the bottom mold element 24 and the ejector 26. The dental crown which is fabricated on the ejector 26, is formed by the injection of acetal homopolymer resin material from a source of acetal homopolymer resin (not shown) into the mold cavity 20, via a channel 30 cut in the top mold element 22.
Fig. 3B shows an initial release stage wherein the bottom mold element 24 is separated from the top mold element 22, thus permitting removal of the molded crown 10 from cavity Fig. 3C shows an ejection stage wherein ejector 26, driven by a piston 28 moves upwardly relative to bottom mold element 24 and pushes crown 10 out of cavity Due to the resilience of the depending side surfaces 14, the action of the ejector 26 is able to disengage the internal mold element 32 from the crown 10 notwithstanding the presence of undercut 16.
It will be appreciated by persons skilled in the art that the present invention is not limited by what has been particularly shown and described hereinabove.
Rather the scope of the present invention includes both combinations and subcombinations of the various features described hereinabove as well as variations and modifications which would occur to persons skilled in the art upon reading the specification and which are not in the prior art.
Claims (6)
1. A dental crown, wherein said dental crown is configured as a single-layer structure made of a thermoplastic polymer material, having a natural appearance of a vital tooth and being configured for readily mounting on a specifically prepared patient's tooth, the crown including: a tooth shaped top surface, and depending n flexible side surfaces extending from said tooth shaped top surface, at least a part 0 of an inner surface of the depending side surfaces defining an undercut at the Cl bottom porion.
2. A dental crown according to claim 1 wherein said thermoplastic polymer material includes an acetal homopolymer resin.
3. A dental crown according to claim 2, wherein said acetal homopolymer resin includes pclyoxymethylene thermoplastic homopolymer.
4. A dental crown according to Claim 2, being fabricated by providing a multi- element mold; and employing the multi-element mold to injection mold the dental crown from acetal homopolymer resin.
A dental crown for use in pediatric dentistry for treatment of primary teeth and permanent molars, the dental crown being configured as a single-layer structure formed of a thermoplastic polymer material, having a natural appearance of a vital tooth and being configured for readily mounting on a specifically prepared patient's tooth, and the dental crown including a tocth shaped top surface and 4 COMS ID No: ARCS-155135 Received by IP Australia: Time 16:37 Date 2007-07-31 .31/0-7 2007 17:04 FAX COLLISON CO IP AUST CANBERRA 1@016/021 0 0 depending flexible side surfaces extending from said tooth shaped top surface, at least a part of an inner surface of the depending side surfaces having tcc an undercut at the bottom portion.
6- A dental crown as described in the specification, with reference to and as illustrated in the accompanying representations. 0 COMS ID No: ARCS-155135 Received by IP Australia: Time 16:37 Date 2007-07-31
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IL142657 | 2001-04-17 | ||
| IL142657A IL142657A (en) | 2001-04-17 | 2001-04-17 | Acetal resin crowns for children |
| US09/903,096 | 2001-07-11 | ||
| US09/903,096 US6592373B2 (en) | 2001-04-17 | 2001-07-11 | Acetal resin crowns for children |
| PCT/IL2002/000310 WO2002083022A2 (en) | 2001-04-17 | 2002-04-16 | Acetal resin crowns for children |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU2002307777A1 AU2002307777A1 (en) | 2003-04-17 |
| AU2002307777B2 true AU2002307777B2 (en) | 2007-08-16 |
Family
ID=26324022
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2002307777A Ceased AU2002307777B2 (en) | 2001-04-17 | 2002-04-16 | Acetal resin crowns for children |
Country Status (9)
| Country | Link |
|---|---|
| EP (1) | EP1414364B1 (en) |
| JP (1) | JP4260485B2 (en) |
| CN (1) | CN1253129C (en) |
| AU (1) | AU2002307777B2 (en) |
| BR (1) | BR0208960A (en) |
| CA (1) | CA2444261C (en) |
| MX (1) | MXPA03009491A (en) |
| RU (1) | RU2295317C2 (en) |
| WO (1) | WO2002083022A2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5030140B2 (en) * | 2006-08-31 | 2012-09-19 | 和美 田中 | Denture manufacturing method |
| KR101445524B1 (en) * | 2014-03-20 | 2014-10-02 | 백현영 | Temporary resin-based crown |
| US20180098828A1 (en) | 2016-10-07 | 2018-04-12 | 3M Innovative Properties Company | Ceramic dental restorations made by additive manufacturing |
| CN109316252B (en) * | 2018-10-17 | 2024-06-28 | 济南市口腔医院 | Device for quickly manufacturing temporary crown |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB639700A (en) * | 1947-08-28 | 1950-07-05 | Aladar Karpati | Jacket tooth crowns and the production thereof |
| US3585723A (en) * | 1969-06-20 | 1971-06-22 | Ion Co The | Dental crown and method of installation thereof |
| US5346397A (en) * | 1993-06-15 | 1994-09-13 | Braiman Kenneth S | Process for making ceramic dental crowns |
| US5672305A (en) * | 1993-06-25 | 1997-09-30 | Kogure; Yamato | Method of manufacturing medical prosthetic articles |
| JPH11216148A (en) * | 1998-01-30 | 1999-08-10 | Shiyuukai | Crown bridge |
| US6186790B1 (en) * | 1998-04-13 | 2001-02-13 | Jeneric/Pentron Incorporated | Prefabricated components for dental appliances |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ZA807108B (en) * | 1979-12-14 | 1981-11-25 | Coors Porcelain Co | Dental appliance and method of manufacture |
| SU1503784A1 (en) * | 1987-12-29 | 1989-08-30 | В. М. Зотов и М. И. Садыкрв | Method of producing plastic crowns |
| RU2054900C1 (en) * | 1990-11-26 | 1996-02-27 | Республиканский инженерно-технический центр порошковой металлургии | Tooth crown and method for its manufacturing |
| WO1996002379A1 (en) * | 1994-07-15 | 1996-02-01 | Asahi Kasei Kogyo Kabushiki Kaisha | Method for the non-resin fluid-assisted injection molding of a resin |
| RU2233140C1 (en) * | 2003-02-14 | 2004-07-27 | Каливраджиян Эдвард Саркисович | Method for manufacturing dentures and device for its implementation |
-
2002
- 2002-04-16 RU RU2003133296/14A patent/RU2295317C2/en not_active IP Right Cessation
- 2002-04-16 WO PCT/IL2002/000310 patent/WO2002083022A2/en not_active Ceased
- 2002-04-16 MX MXPA03009491A patent/MXPA03009491A/en active IP Right Grant
- 2002-04-16 JP JP2002580830A patent/JP4260485B2/en not_active Expired - Fee Related
- 2002-04-16 CN CNB028083423A patent/CN1253129C/en not_active Expired - Fee Related
- 2002-04-16 CA CA2444261A patent/CA2444261C/en not_active Expired - Fee Related
- 2002-04-16 AU AU2002307777A patent/AU2002307777B2/en not_active Ceased
- 2002-04-16 EP EP02761962A patent/EP1414364B1/en not_active Expired - Lifetime
- 2002-04-16 BR BR0208960-2A patent/BR0208960A/en not_active Application Discontinuation
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB639700A (en) * | 1947-08-28 | 1950-07-05 | Aladar Karpati | Jacket tooth crowns and the production thereof |
| US3585723A (en) * | 1969-06-20 | 1971-06-22 | Ion Co The | Dental crown and method of installation thereof |
| US5346397A (en) * | 1993-06-15 | 1994-09-13 | Braiman Kenneth S | Process for making ceramic dental crowns |
| US5672305A (en) * | 1993-06-25 | 1997-09-30 | Kogure; Yamato | Method of manufacturing medical prosthetic articles |
| JPH11216148A (en) * | 1998-01-30 | 1999-08-10 | Shiyuukai | Crown bridge |
| US6186790B1 (en) * | 1998-04-13 | 2001-02-13 | Jeneric/Pentron Incorporated | Prefabricated components for dental appliances |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2002083022A2 (en) | 2002-10-24 |
| MXPA03009491A (en) | 2004-12-06 |
| BR0208960A (en) | 2004-09-08 |
| EP1414364A4 (en) | 2005-10-19 |
| EP1414364A2 (en) | 2004-05-06 |
| WO2002083022A3 (en) | 2004-03-04 |
| RU2003133296A (en) | 2005-03-10 |
| JP2004534568A (en) | 2004-11-18 |
| JP4260485B2 (en) | 2009-04-30 |
| EP1414364B1 (en) | 2008-09-10 |
| CA2444261A1 (en) | 2002-10-24 |
| RU2295317C2 (en) | 2007-03-20 |
| CN1253129C (en) | 2006-04-26 |
| CN1516566A (en) | 2004-07-28 |
| CA2444261C (en) | 2011-06-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FGA | Letters patent sealed or granted (standard patent) | ||
| MK14 | Patent ceased section 143(a) (annual fees not paid) or expired |